Self-capacitive touch panel

Abstract

A self-capacitive touch panel including two sensing regions is provided. Each of the sensing regions includes a first sensing channel, a second sensing channel, a border electrode and multiple central electrodes. The border electrode utilizes the first sensing channel exclusively. The central electrodes share the second sensing channel. The border electrode has a first centroid, which represents a position where a capacitance change contributed by the border electrode occurs. The central electrodes have a second centroid, which represents a position where a capacitance change contributed by the central electrode occurs. An average distance from the first centroid to all possible touch points in the border electrodes is shorter than an average distance from the second centroid to all possible touch points in the central electrodes.

What is claimed is: 
     
         1 . A self-capacitive touch panel, comprising:
 two sensing regions, each comprising:
 a first sensing channel, connected to the first sensor; 
 a second sensing channel, connected to the second sensor; 
 a border electrode, exclusively utilizing the first channel, having a planar contour similar to a predetermined polygon, the border electrode further having a first centroid that represents a position at which a capacitance change contributed by the border electrode occurs; and 
 a plurality of central electrodes, sharing the second sensing channel, each having a planar contour similar to the predetermined polygon, the central electrodes further having a second centroid that represents a position at which a capacitance change contributed by the central electrodes occurs; 
   wherein, a first average distance from the first centroid to all possible touch points in the border electrode is shorter than a second average distance from the second centroid to all possible touch points in the central electrodes, and the predetermined polygon tapers along a reference direction.   
     
     
         2 . A self-capacitive touch panel, comprising:
 two sensing regions, each comprising:
 a first sensing channel, connected to the first sensor; 
 a second sensing channel, connected to the second sensor; 
 a plurality of border electrodes, sharing the first channel, each having a planar contour similar to a first right triangle, the border electrodes further having a first centroid that represents a position at which a capacitance change contributed by the border electrodes occurs; and 
 a plurality of central electrodes, sharing the second sensing channel, each having a planar contour similar to a second right triangle, the central electrodes further having a second centroid that represents a position at which a capacitance change contributed by the central electrodes occurs; 
   wherein, a first average distance from the first centroid to all possible touch points in the border electrodes is shorter than a second average distance from the second centroid to all possible touch points in the central electrodes.   
     
     
         3 . A self-capacitive touch panel, comprising:
 a first sensing region, comprising:
 a first sensing channel; 
 a second sensing channel; 
 an N number of first border electrodes, connected to the first sensing channel, having a first centroid that represents a position at which a capacitance change contributed by the N number of first border electrodes occurs, N being a positive integer; and 
 an M number of first central electrodes, connected to the second sensing channel, having a second centroid that represents a position at which a capacitance change contributed by the M number of first central electrodes occurs, M being a positive integer; and 
   a second sensing region, comprising:
 a third sensing channel; 
 a fourth sensing channel; 
 a P number of second border electrodes, connected to the third sensing channel, having a third centroid that represents a position at which a capacitance change contributed by the P number of second border electrodes occurs, P being a positive integer; and 
 a Q number of second central electrodes, connected to the fourth sensing channel, having a fourth centroid that represents a position at which a capacitance change contributed by the Q number of second central electrodes occurs, Q being a positive integer; 
   wherein, a first average distance from the first centroid to all possible touch points in the N number of first border electrodes is shorter than a second average distance from the second centroid to all possible touch points in the M number of first central electrodes; a third average distance from the third centroid to all possible touch points in the P number of second border electrodes is shorter than a fourth average distance from the fourth centroid to all possible touch points in the Q number of second central electrodes.   
     
     
         4 . The self-capacitive touch panel according to  claim 3 , wherein a planar contour of each of the first border electrodes is similar to a first right triangle, a planar contour of each of the first central electrodes is similar to a second right triangle, a planar contour of each of the second border electrodes is similar to a third right triangle, and a planar contour of each of the second central electrodes is similar to a fourth right triangle; a shortest side of each of the first border electrodes, each of the first central electrodes, each of the second border electrodes and each of the second central electrodes are parallel to a same reference direction. 
     
     
         5 . The self-capacitive touch panel according to  claim 4 , wherein a longer leg of the first right triangle has a first length, a longer leg of the second right triangle has a second length, a longer leg of the third right triangle has a third length, and a longer leg of the fourth right triangle has a fourth length; a sum of the first length and the third length is substantially equal to a sum of the second length and the fourth length. 
     
     
         6 . The self-capacitive touch panel according to  claim 4 , wherein the positive integer N is equal to the positive integer M, and the first right triangle is smaller than the second right triangle. 
     
     
         7 . The self-capacitive touch panel according to  claim 4 , wherein the positive integer N is smaller than the positive integer, and the first right triangle is same as the second right triangle.